package com.example.tests;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.Random;

import com.thoughtworks.xstream.XStream;

public class GroupDataGenerator {

	public static void main(String[] args) throws IOException {
		if (args.length < 3) {
		  System.out.println("Please specify parameters: <amount ot test data> <file> <format>");
	      return;
		}
		
        int amount = Integer.parseInt(args[0]);
        File file = new File(args[1]);
        String format = args[2];
        
        if (file.exists()) {
        	System.out.println("File exists, please remove it manually: " + file);
  	      return;
        }
        
        List<GroupData> groups = generateRandomGroups(amount);
        if ("csv".equals(format)) {
        	saveGroupsToCsvFile(groups, file);
        } else if ("xml".equals(format)) {
        	saveGroupsToXmlFile(groups, file);
        } else {
        	System.out.println("Unknown format " + format);
        	return;
        }
        
       
	}

	private static void saveGroupsToXmlFile(List<GroupData> groups, File file) throws IOException {
		XStream xstream = new XStream();
		xstream.alias("group", GroupData.class);
		String xml = xstream.toXML(groups);
		FileWriter writer = new FileWriter(file);
		writer.write(xml);
		writer.close();
		
	}
	
	public static List<GroupData> loadGroupsFromXmlFile(File file) {
		XStream xstream = new XStream();
		xstream.alias("group", GroupData.class);
		return (List<GroupData>) xstream.fromXML(file);
		
	}

	private static void saveGroupsToCsvFile(List<GroupData> groups, File file) throws IOException {
		FileWriter writer = new FileWriter(file);
		for (GroupData group : groups) {
			writer.write(group.getName() + "," + group.getHeader() + "," + group.getFooter() + ",!" + "\n");
		}
		writer.close();
	}
	
	public static List<GroupData> loadGroupsFromCsvFile(File file) throws IOException {
		List<GroupData> list = new ArrayList<GroupData>();
		FileReader reader = new FileReader(file);
		BufferedReader bufferedReader = new BufferedReader(reader);
		String line = bufferedReader.readLine();
		while (line != null) {
			String[] part = line.split(",");
			GroupData group = new GroupData()
			.withName(part[0])
			.withHeader(part[1])
			.withFooter(part[2]);
			list.add(group);
			line = bufferedReader.readLine();
		}		
		bufferedReader.close();
		return list;
	}

	public static List<GroupData> generateRandomGroups(int amount) {
		 List<GroupData> list = new ArrayList<GroupData>();
		 for (int i = 0; i < amount; i++) {
			 GroupData group = new GroupData()
			 .withName(generateRandomString())
			 .withHeader(generateRandomString())
			 .withFooter(generateRandomString());
			 list.add(group);
		 }
		 return list;
	}
	
	 public static String generateRandomString() {
		    Random rnd = new Random();
		    if (rnd.nextInt(3) == 0) {
		   	  return "";
		    } else {
		      return "test" + rnd.nextInt();
		    }
		 }
}

